The sound is called Solo and is the lead for the tune of the same name. Skipping the boring details, I can now record a live improv, with different voices for left and right hand in a way that wasn't possible for me previously.

Thanks a lot. Yes, I really enjoy doing something like this. It's usually only weekends though, as I find my most inspirational time is always the middle of the night. It then doesn't matter if I'm zonked right out of it on a Sunday